Duplicate sound-record.



PATENTED JUNE 4, 1907. M J. W. AYLSWORTH.

DUPLICATE SOUND RECORD. APPLIOATION FILED MAY 31, 1905.

UNITED STATES .1 one it. AYLSWOR'IH NEIV JERSEY PATEKT COMPAN PATENT OFFICE.

'1'. OF IVEST ORANGE, NEW JERSEY,

A CORPORATION OF NEW JERSEY.

DUPLICATE SOUND-RECORD.

1 Specification of Letters Patent.

Application filed May 31 270 (1 27 Ill/M17111 it nmy concern:

properties of toug inflammability,

Be it known that I, JONAS W. AYLswoRTn, a citizen of the United States, residing at-223 Midland avenue, East Orange, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Duplicate Sound-Records, of which the following is a description.

Myinvention relates to an improved duplicate sound record made of a tohgh, permanent material capable of receiving and retaining an absolutely accurate copy of a matrix, having no ingredient which will evaporate to effect the record surface (as is the case with camphor in celluloid), which will be practically non-inflammable and which will be sulliciently flexible topermit of its being collapsed when it is desired to remove the same from the matrix.

Duplicate sound records have heretofore been made of celluloid, but owing to the slow evaporation of the camphor, these records become minutely pitte'd in time, so as to present a rough and scratchy surface.

In an application filed on even date herewith, I describe an improved composition of a celluloid-like nature, said com osition being based on the discovery that a alogenized fatty acid or derivative thereof, such as chlorinated stearic acid, acts as a solid solvent for yroxylin or other cellulose esters, such as t e esters of the acetic series, the compound being manufactured by the employment of a common solvent, such as acetone, which upon evaporation results'in a celluloid-like com osition having desirable ness, flexibility and nonand being practically permanent, since the solid solvent does not evaporate, as is the case with camphor in celluloid.

My present invention relates to the productionof a duplicate-sound record of this improved material. The advantages of such a sound record are great toughness and smoothness of the record surface, absolute permanencythereof and substantial non-inflammabihty.

Reference is hereby made to the accompa n 'n drawin which shows a conventional Y c g I record tablet m'th ents ofthereto.

the names of the ingredimy improved composition applied Patented June 4, 1907'.

,1906. SerialNo- 819,466-

I In producing the compound I first'obtain a halogenized fatty acid or fatty acid derivative, as I describe in said application] For example, ordinary commercial stearic acid may be chlorinated for several days in the presence of a catalytic agent, such as iodin or antimony chlorid, until a more or less viscid, oily, or rcsinated solid body is secured, dependent upon the extent to which the chlorinating process is carried. The solvent thus secured is added in varying proportions to the desired cellulose body, such as pyroxylin and may actually exceed the l quantity of the latter." The two bodies thus I added together are now dissolved in a common solvent, such as acetone, to form a more or less viscidfluid solution, one having the limpidity of molasses being suitable for the pur ose. ,Duplicate sound recordsare made. 0 this material in any suitable way, either by forming tubes of the same and expanding such tubes under heat and pressure against the walls of the matrix, as is done with the manufacture of ordinary celluloid records at the present time, or by the special process described in my application for Letters Patent filed concurrently herewith. In the latter process the matrix is ra idlyrotated and the solution introduced tiierein so as to be uniformly distributed against the 7 matrix walls by the centrifugal force developed and thereby take an absolutely accu- -rate impression of the record surface. In this distribution of the solution any air bubbles'will be forced radially inward. After the solution has been thus distributed over the record surface of the rotating matrix which'will require only a few seconds, the 90 solvent is evaporated by blowing a blast of warm air through the matrix and preferably also by' heating the matrix exteriorly so as to facilitate the evaporation. When .the, 1'. solvent has been entirely evaporated the 5 record will exist on the interior of the wallsas a continuous homogeneous cylindrical structure carrying an absolutely accurate representation of the record surface and may be removed from the matrix either by immersing the latter in hot water and collapsing the record inwardly or by chilling the matrix so as to cause the record to shrink radially and permit of its withdrawal.

Having now'describedmy invention, What a composition of a cellulose ester of the I claim as new and desire tosecure by Let ters Patent is as follows 3- 1. A duplicate sound record composed of a composition of a cellulose ester and a halogenized fatty acid or derivative thereof, substantially as set forth.

2. A duplicate sound record composed of a composition of a cellulose ester and a clilo-- 1o rinatedfatty acid or derivative thereof, substantially as set forth.

3. A duplicate sound record com osed of a composition of a cellulose ester and ialogem ized 'stearic acid, substantially as s vt forth.

4; A duplicate sound record composedof I a composition of a cellulose ester and ch1ori' nated stearictacid; substantially as setfortbv 5. A duplicate sound record a composition 0 composed of acetic series and a lial-ogenizcd"fatty acidoi' derivative thereof, substantial ly as set lorth 6. A duplicate'sound record composed-oi a composition of a cellulose ester of the acetic series, and 1 lialogenized .stear-io. acid; substantiallyasset forth;

7. Afduplicatc sound record composed of cellulose ester er the acetic series-,- and. chlorinated stearic acid,.

' substantially 'as set forth;

gued and witnessed 0' This specification this 29th day of'May 1906; v

Jonas; W; M nswonfrn. Witnesses:

FRANK-L. Drnn,

ANNA R. KLEIYIMQ 

